Burnout
Fill the Nitrous bar then use it all in one go without hitting anything
2/12/2014
11:48:39 PM
Common 85.7%
Never Seen that Before
Kill one of the unique enemies listed in the Never Seen That Before Challenge.
2/2/2014
4:33:16 PM
Common 61.6%Common 85.7%Common 61.6%
